New Bio-Based Membrane Captures 94% of Toxic PFAS in Water

Scientists at the University of Bath have created a bio-based polymer membrane capable of removing harmful PFAS chemicals from water. Early tests show it can extract over 94% of PFOA, a common type of PFAS, under lab conditions. The team is now preparing to trial the membrane in real-world settings to assess its broader potential. The membrane works by absorbing moisture when placed in water, causing its structure to shift and trap PFAS molecules. Made from ultra-fine polymer fibres sourced from renewable materials, it avoids the need for fossil-based components. Unlike traditional methods that focus on breaking down PFAS, this approach prioritises capturing and reusing the membrane itself.

Once saturated, the membrane can be heated to release the trapped contaminants, allowing it to be reused while retaining up to 93% of its original efficiency. The process is also quick, with half of the pollutant load captured within the first hour of exposure. Scaling this technology could offer a more sustainable solution for large-scale water treatment, combining high performance with reusability.

PFAS contamination remains a persistent challenge, particularly when dealing with large volumes of water. If successful in field tests, the membrane could pave the way for a new generation of treatment materials that balance effectiveness with environmental benefits. The University of Bath's membrane presents a promising step in tackling PFAS pollution through a reusable, bio-based solution. With real-world trials now underway, its ability to maintain high removal rates outside the lab will determine its future role in water treatment. If scaled effectively, the technology could help address a long-standing environmental issue with a more sustainable approach.